证券市场导报
證券市場導報
증권시장도보
Securities Market Herald
2015年
5期
43~51
,共null页
融券卖空 价格发现 价值高估 异质信念
融券賣空 價格髮現 價值高估 異質信唸
융권매공 개격발현 개치고고 이질신념
short selling, price discovery, overvaluation, divergent opinions
融券卖空对于股市的影响一直富有争议。本文利用沪深A股数据检验融券卖空的价格发现效应,研究结果表明:基于市场模型的实证结果与Miller(1977)所提出的卖空限制会导致股票价值高估理论基本相符,并且基于市场调整模型的实证结果在统计上更加显著;融券卖空实施后异质信念程度与股票收益并未呈现负相关,与Miller(1977)所提出的理论不符。此外,本文还实证检验了融券卖空对个股收益率分布的影响,结果显示:融券卖空后股票日收益率分布的负偏程度和个股日收益率的波动性都显著降低,股价崩盘的概率也显著下降。
融券賣空對于股市的影響一直富有爭議。本文利用滬深A股數據檢驗融券賣空的價格髮現效應,研究結果錶明:基于市場模型的實證結果與Miller(1977)所提齣的賣空限製會導緻股票價值高估理論基本相符,併且基于市場調整模型的實證結果在統計上更加顯著;融券賣空實施後異質信唸程度與股票收益併未呈現負相關,與Miller(1977)所提齣的理論不符。此外,本文還實證檢驗瞭融券賣空對箇股收益率分佈的影響,結果顯示:融券賣空後股票日收益率分佈的負偏程度和箇股日收益率的波動性都顯著降低,股價崩盤的概率也顯著下降。
융권매공대우고시적영향일직부유쟁의。본문이용호심A고수거검험융권매공적개격발현효응,연구결과표명:기우시장모형적실증결과여Miller(1977)소제출적매공한제회도치고표개치고고이론기본상부,병차기우시장조정모형적실증결과재통계상경가현저;융권매공실시후이질신념정도여고표수익병미정현부상관,여Miller(1977)소제출적이론불부。차외,본문환실증검험료융권매공대개고수익솔분포적영향,결과현시:융권매공후고표일수익솔분포적부편정도화개고일수익솔적파동성도현저강저,고개붕반적개솔야현저하강。
The issue of how short selling impacts capital market is highly controversial. By analyzing the price effects of short selling in Shanghai and Shenzhen stock markets, we find that the results based on market model are significantly negative, which are consistent with Miller's (1977) theory, and the empirical results based on market-adjusted model are more statistical significant. The degree of divergence of opinions and stock returns after short sales did not show a negative correlation, which don't support Miller's (1977) theory. We also document lower volatility, less negative skewness of individual stocks daily return and lower frequency of extreme negative daily returns when short sales are allowed.